docs: typos and minor edits in several modules

docs: typos and minor edits in several modules

Mostly quite minor edits.  Those possibly of more interest are:

  emitter.setMaxListeners(n)

    That the limit is per event name for an emitter.

  fs.readlink()

    Not a path, but rather the symbolic link's string value, which
      would be at best a partial path, certainly not a 'resolvedPath'

  global.__filename

    This may be "well-known" but this is a full path to the module
    that referencing code is running in.  It is not the main program's
    path, unless you are in the main program.  Each module knows only
    its own path.

  server.listen(port,...)

    I actually needed this functionality... "gimme just _any_ next port"

  stream.end()
  stream.destroy()

    Yeah, everybody knows what happens to the queued data, but let's
    make it *really* explicit for the first readers.